HH Zong Rinpoche is the unmistaken incarnation of the previous Zong Rinpoche, who was a powerful Dorje Shugden lama. Like in HH Trijang Rinpoche's case, this again proves that Dorje Shugden is not a demon because if anyone does demon practices, they would be incarnated in the hell realms.
If HH Zong Rinpoche's previous incarnation was a strong Dorje Shugden practitioner, it is of course expected that his current incarnation would be also. However, since this current incarnation was no doubt brought up under a monastic environment where Dorje Shugden is seen as the devil incarnate, I wonder if he would have received the practice, albeit privately? And if so, from whom?
I have read that Zong Rinpoche is an erudite scholar and top debater and is already exhibiting his characteristics from his previous incarnation. This reincarnation just goes to prove that Dorje Shugden is a Buddha, and nothing less.